Which statement about the lubrication circuit is correct?

Which statement about the lubrication circuit is correct?

• A. It operates at converter pressure.
• B. It is usually supplied by the converter/cooler circuit.
• C. It is usually at line pressure.
• D. It is a splash lubricated by the internal rotating components.

Answer: (B)

The lubrication circuit in this drive train is designed to provide a steady flow of oil for lubrication and cooling, fed from the same path that handles the converter and cooler circuit. This arrangement ensures the oil is at a suitable, moderate pressure and temperature as it reaches bearings, gears, and clutch packs, while also being cooled before returning to the sump. It’s not tied to the high line pressure used for actuation, nor is it simply splash-lubricated, which wouldn’t supply enough oil flow or cooling for the rotating components at typical speeds. Therefore, being usually supplied by the converter/cooler circuit best describes how the lubrication system is set up.

The lubrication circuit in this drive train is designed to provide a steady flow of oil for lubrication and cooling, fed from the same path that handles the converter and cooler circuit. This arrangement ensures the oil is at a suitable, moderate pressure and temperature as it reaches bearings, gears, and clutch packs, while also being cooled before returning to the sump. It’s not tied to the high line pressure used for actuation, nor is it simply splash-lubricated, which wouldn’t supply enough oil flow or cooling for the rotating components at typical speeds. Therefore, being usually supplied by the converter/cooler circuit best describes how the lubrication system is set up.